:root{--bg: #f5f7fb;--card: #ffffff;--ink: #1f2933;--muted: #6b7280;--line: #e5e7eb;--brand: #2563eb;--brand-dark: #1d4ed8;--star: #f59e0b;--danger: #dc2626;--radius: 12px;--shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .04)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,PingFang TC,Noto Sans TC,Helvetica Neue,Arial,sans-serif;line-height:1.6}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:960px;margin:0 auto;padding:24px 16px 64px}.navbar{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.navbar-inner{max-width:960px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:16px}.brand{font-weight:700;font-size:18px;color:var(--ink)}.brand:hover{text-decoration:none}.nav-spacer{flex:1}.nav-link{color:var(--muted);font-size:15px}.nav-user{color:var(--muted);font-size:14px}.karma-chip{font-size:14px;font-weight:600;color:var(--brand-dark);background:#eef2ff;padding:4px 10px;border-radius:999px;white-space:nowrap}.btn{display:inline-block;padding:9px 16px;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-size:15px;cursor:pointer;transition:background .15s,border-color .15s}.btn:hover{background:#f3f4f6;text-decoration:none}.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-dark)}.btn-danger{color:var(--danger);border-color:#fca5a5}.btn-danger:hover{background:#fef2f2}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-block{display:block;width:100%;text-align:center}.field{margin-bottom:16px}.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}.input,.select,.textarea{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit;background:#fff}.textarea{min-height:90px;resize:vertical}.row{display:flex;gap:12px}.row>*{flex:1}.hint{font-size:13px;color:var(--muted);margin-top:4px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.auth-card{max-width:400px;margin:40px auto}.karma-card{margin-bottom:4px}.karma-top{display:flex;align-items:center;justify-content:space-between}.karma-score{font-size:34px;font-weight:800;line-height:1;color:var(--brand)}.karma-label{font-size:13px;color:var(--muted);margin-top:2px}.karma-badge{color:#fff;font-size:14px;font-weight:700;padding:6px 14px;border-radius:999px}.karma-bar{height:8px;background:var(--line);border-radius:999px;overflow:hidden;margin-top:16px}.karma-bar-fill{height:100%;background:linear-gradient(90deg,var(--brand),#7c3aed);border-radius:999px;transition:width .4s ease}.page-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px;flex-wrap:wrap}.page-title{font-size:24px;font-weight:700;margin:0}.filters{display:flex;gap:12px;margin-bottom:20px;flex-wrap:wrap}.filters .input,.filters .select{width:auto;flex:1;min-width:140px}.exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.exam-card{display:flex;flex-direction:column;gap:8px}.exam-card h3{margin:0;font-size:17px}.exam-card h3 a{color:var(--ink)}.tags{display:flex;flex-wrap:wrap;gap:6px}.tag{font-size:12px;padding:2px 9px;border-radius:999px;background:#eef2ff;color:var(--brand-dark)}.tag.diff-易{background:#ecfdf5;color:#047857}.tag.diff-中{background:#fffbeb;color:#b45309}.tag.diff-難{background:#fef2f2;color:#b91c1c}.card-sub{margin:0;font-size:13px;color:var(--muted)}.detail-subline{margin:4px 0 0;font-size:14px;color:#374151}.exam-meta{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--muted);margin-top:auto}.stars{display:inline-flex;gap:2px;font-size:18px;color:var(--star)}.stars .empty{color:#d1d5db}.stars.interactive span{cursor:pointer}.rating-num{font-size:13px;color:var(--muted);margin-left:6px}.detail-desc{white-space:pre-wrap;color:#374151}.detail-actions{display:flex;gap:12px;margin:20px 0;flex-wrap:wrap}.section-title{font-size:18px;font-weight:700;margin:28px 0 12px}.review{border-top:1px solid var(--line);padding:14px 0}.review-head{display:flex;align-items:center;gap:8px;font-size:14px}.review-author{font-weight:600}.review-date{color:var(--muted);font-size:13px}.review-comment{margin:6px 0 0;color:#374151;white-space:pre-wrap}.alert{padding:10px 14px;border-radius:8px;font-size:14px;margin-bottom:16px}.alert-error{background:#fef2f2;color:#b91c1c;border:1px solid #fca5a5}.alert-ok{background:#ecfdf5;color:#047857;border:1px solid #6ee7b7}.alert-info{background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe}.empty-state{text-align:center;padding:48px 16px;color:var(--muted)}.footer{text-align:center;padding:24px;color:var(--muted);font-size:13px;border-top:1px solid var(--line);background:var(--card)}@media (max-width: 480px){.row{flex-direction:column}}